Swift: Navigate to new ViewController using button

Question

I have a single view application which connects to parse and verifies user log in information and updates a UILabel saying "Yay, You've logged in sucessfully" - Now I want it to navigate to a new view (Which will be the main part of the app).

I have dragged a new view controller onto the storyboard and Ctrl-Drag the button and linked it to the new controller with show. However, the moment I load the app and click the button it goes straight to the new view. I need it to only go there if the right part of the if-else statement is triggered.

Does this make sense? Thank for any help guys. much appreciated.

EDIT

The if statement is:

if usrEntered != "" && pwdEntered != "" {
        PFUser.logInWithUsernameInBackground(usrEntered, password:pwdEntered) {
            (user: PFUser!, error: NSError!) -> Void in
            if user != nil {
                self.messageLabel.text = "You have logged in";
            } else {
                self.messageLabel.text = "You are not registered";
            }
        }
    }

and its located in the ViewController.swift file

the bit that is: self.messageLabel.text = "You have logged in"; - I want it to redirect to a new view — DannieCoderBoi, Nov 23 '14 at 22:18
possible duplicate of [Xcode 6.1 button with segue](http://stackoverflow.com/questions/26799433/xcode-6-1-button-with-segue) — Paulw11, Nov 23 '14 at 22:20
When is this if statement being hit? What method is it living in your view controller implementation? If you create a new project, add another view controller in the interface builder, add the button to the root view controller, and bind it to `show` the new view controller-- it works There must be something else happening that is forcing your new view controller to show... — A O, Nov 23 '14 at 22:32

score 55 · Accepted Answer · edited May 23 '17 at 12:17

55

First off as I explain in this answer, you need to drag the segue from the overall UIViewController to the next UIViewController, i.e. you shouldn't specifically connect the UIButton (or any IBOutlet for that matter) to the next UIViewController if the transition's conditional:

storyboard segue

You'll also need to assign an identifier to the segue. To do so, you can select the segue arrow then type in an identifier within the right-hand panel:

segue identifier

Then to perform the actual segue, use the performSegueWithIdentifier function within your conditional, like so:

if user != nil {
    self.messageLabel.text = "You have logged in";
    self.performSegueWithIdentifier("segueIdentifier", sender: self)
} else {
    self.messageLabel.text = "You are not registered";
}

where "segueIdentifier" is the identifier you've assigned to your segue within the storyboard.

edited May 23 '17 at 12:17

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answered Nov 23 '14 at 22:36

Lyndsey Scott

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can you tell me why the new viewController doesnt have a .swift file for code to run in the view? – DannieCoderBoi Nov 23 '14 at 22:49
What do you mean? When you create a new view controller you need to create it as either a swift or obj-c file... So make it a swift file... – Lyndsey Scott Nov 23 '14 at 23:00
Yeah I can do that. But how do I assign the new file to the new view? – DannieCoderBoi Nov 23 '14 at 23:02
@DannieCoderBoi Sorry, don't have time right now, but here's how to link your view controller: http://stackoverflow.com/a/19370389/2274694 – Lyndsey Scott Nov 23 '14 at 23:12
There's no segue; honestly I don't understnad why something that takes 2 second sin Android takes 20 hours to lear in xcode. – pete Aug 08 '20 at 10:57

Swift: Navigate to new ViewController using button

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